nohz: Reuse ktime in sub-functions of tick_check_idle.

On a system with NOHZ=y tick_check_idle calls tick_nohz_stop_idle and
tick_nohz_update_jiffies. Given the right conditions (ts->idle_active
and/or ts->tick_stopped) both function get a time stamp with ktime_get.
The same time stamp can be reused if both function require one.

On s390 this change has the additional benefit that gcc inlines the
tick_nohz_stop_idle function into tick_check_idle. The number of
instructions to execute tick_check_idle drops from 225 to 144
(without the ktime_get optimization it is 367 vs 215 instructions).

before:

 0)               |  tick_check_idle() {
 0)               |    tick_nohz_stop_idle() {
 0)               |      ktime_get() {
 0)               |        read_tod_clock() {
 0)   0.601 us    |        }
 0)   1.765 us    |      }
 0)   3.047 us    |    }
 0)               |    ktime_get() {
 0)               |      read_tod_clock() {
 0)   0.570 us    |      }
 0)   1.727 us    |    }
 0)               |    tick_do_update_jiffies64() {
 0)   0.609 us    |    }
 0)   8.055 us    |  }

after:

 0)               |  tick_check_idle() {
 0)               |    ktime_get() {
 0)               |      read_tod_clock() {
 0)   0.617 us    |      }
 0)   1.773 us    |    }
 0)               |    tick_do_update_jiffies64() {
 0)   0.593 us    |    }
 0)   4.477 us    |  }

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: john stultz <johnstul@us.ibm.com>
LKML-Reference: <20090929122533.206589318@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 33 insertions, 29 deletions

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index e0f59a21c061..7378e2c71ca6 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -134,18 +134,13 @@ __setup("nohz=", setup_tick_nohz);
  * value. We do this unconditionally on any cpu, as we don't know whether the
  * cpu, which has the update task assigned is in a long sleep.
  */
-static void tick_nohz_update_jiffies(void)
+static void tick_nohz_update_jiffies(ktime_t now)
 {
         int cpu = smp_processor_id();
         struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
         unsigned long flags;
-        ktime_t now;
-
-        if (!ts->tick_stopped)
-                return;
 
         cpumask_clear_cpu(cpu, nohz_cpu_mask);
-        now = ktime_get();
         ts->idle_waketime = now;
 
         local_irq_save(flags);
@@ -155,20 +150,17 @@ static void tick_nohz_update_jiffies(void)
         touch_softlockup_watchdog();
 }
 
-static void tick_nohz_stop_idle(int cpu)
+static void tick_nohz_stop_idle(int cpu, ktime_t now)
 {
         struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+        ktime_t delta;
 
-        if (ts->idle_active) {
-                ktime_t now, delta;
-                now = ktime_get();
-                delta = ktime_sub(now, ts->idle_entrytime);
-                ts->idle_lastupdate = now;
-                ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
-                ts->idle_active = 0;
+        delta = ktime_sub(now, ts->idle_entrytime);
+        ts->idle_lastupdate = now;
+        ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
+        ts->idle_active = 0;
 
-                sched_clock_idle_wakeup_event(0);
-        }
+        sched_clock_idle_wakeup_event(0);
 }
 
 static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
@@ -431,7 +423,11 @@ void tick_nohz_restart_sched_tick(void)
         ktime_t now;
 
         local_irq_disable();
-        tick_nohz_stop_idle(cpu);
+        if (ts->idle_active || (ts->inidle && ts->tick_stopped))
+                now = ktime_get();
+
+        if (ts->idle_active)
+                tick_nohz_stop_idle(cpu, now);
 
         if (!ts->inidle || !ts->tick_stopped) {
                 ts->inidle = 0;
@@ -445,7 +441,6 @@ void tick_nohz_restart_sched_tick(void)
 
         /* Update jiffies first */
         select_nohz_load_balancer(0);
-        now = ktime_get();
         tick_do_update_jiffies64(now);
         cpumask_clear_cpu(cpu, nohz_cpu_mask);
 
@@ -579,22 +574,18 @@ static void tick_nohz_switch_to_nohz(void)
  * timer and do not touch the other magic bits which need to be done
  * when idle is left.
  */
-static void tick_nohz_kick_tick(int cpu)
+static void tick_nohz_kick_tick(int cpu, ktime_t now)
 {
 #if 0
         /* Switch back to 2.6.27 behaviour */
 
         struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
-        ktime_t delta, now;
-
-        if (!ts->tick_stopped)
-                return;
+        ktime_t delta;
 
         /*
          * Do not touch the tick device, when the next expiry is either
          * already reached or less/equal than the tick period.
          */
-        now = ktime_get();
         delta = ktime_sub(hrtimer_get_expires(&ts->sched_timer), now);
         if (delta.tv64 <= tick_period.tv64)
                 return;
@@ -603,9 +594,26 @@ static void tick_nohz_kick_tick(int cpu)
 #endif
 }
 
+static inline void tick_check_nohz(int cpu)
+{
+        struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+        ktime_t now;
+
+        if (!ts->idle_active && !ts->tick_stopped)
+                return;
+        now = ktime_get();
+        if (ts->idle_active)
+                tick_nohz_stop_idle(cpu, now);
+        if (ts->tick_stopped) {
+                tick_nohz_update_jiffies(now);
+                tick_nohz_kick_tick(cpu, now);
+        }
+}
+
 #else
 
 static inline void tick_nohz_switch_to_nohz(void) { }
+static inline void tick_check_nohz(int cpu) { }
 
 #endif /* NO_HZ */
 
@@ -615,11 +623,7 @@ static inline void tick_nohz_switch_to_nohz(void) { }
 void tick_check_idle(int cpu)
 {
         tick_check_oneshot_broadcast(cpu);
-#ifdef CONFIG_NO_HZ
-        tick_nohz_stop_idle(cpu);
-        tick_nohz_update_jiffies();
-        tick_nohz_kick_tick(cpu);
-#endif
+        tick_check_nohz(cpu);
 }
 
 /*